Add nix-shell for macos android development (kernelkind)

ircmode: tighten username (William Casarin)

we should just called this damus (William Casarin)

Merge remote-tracking branch 'android/master' (William Casarin)

Create SECURITY.md (alltheseas)

pushed to notedeck:refs/heads/master

http://git.jb55.com/notedeck/commit/272da6ccedc07370c7f3024f0fd6cfc1681a2c86.html